JP2013125994A5

JP2013125994A5 -

Info

Publication number: JP2013125994A5
Application number: JP2011272157A
Authority: JP
Filing date: 2011-12-13
Publication date: 2014-06-05
Anticipated expiration: 2031-12-13

Description

上記課題を解決するために、本発明の画像圧縮装置は、ユーザから解像度に関する指定を受け付ける受付手段と、画像を入力する入力手段と、前記入力された画像の解像度を低下させる第１の低下手段と、前記第１の低下手段により解像度が低下させられた画像における文字領域の色を、当該文字領域以外の領域の色を用いて変更する変更手段と、前記文字領域の色が変更された画像の解像度を、前記受け付けた指定に基づく解像度へと低下させる第２の低下手段と、前記第２の低下手段により解像度が低下させられた画像を圧縮する圧縮手段とを有することを特徴とする。 In order to solve the above-described problems, an image compression apparatus according to the present invention includes a receiving unit that receives a designation regarding resolution from a user, an input unit that inputs an image, and a first reduction unit that reduces the resolution of the input image. Changing means for changing the color of the character area in the image whose resolution has been reduced by the first reduction means using the color of the area other than the character area; and an image in which the color of the character area has been changed The second reduction means for reducing the resolution to a resolution based on the received designation, and compression means for compressing the image whose resolution has been reduced by the second reduction means .

Claims

A receiving means for accepting a resolution related specification from a user;
An input means for inputting an image;
First reduction means for reducing the resolution of the input image;
Changing means for changing the color of the character area in the image whose resolution has been reduced by the first reduction means using the color of the area other than the character area;
Second reduction means for reducing the resolution of the image in which the color of the character area has been changed to a resolution based on the received designation;
An image compression apparatus comprising: compression means for compressing an image whose resolution has been reduced by the second reduction means.

The image processing apparatus according to claim 1, wherein reducing the resolution means reducing the resolution.

Binarization means for performing binarization in which pixels that are darker than the threshold in the input image are black and pixels that are lighter than the threshold are white;
Tracking means for performing contour tracking on the binary image obtained by the binarization means;
The image compression apparatus according to claim 1, further comprising a specifying unit that specifies the character area based on a tracking result obtained by the tracking unit.

The changing means is
Corresponding to the position of white pixels located around the character area specified by the specifying means in the binary image;
Determining the background color by referring to the color of the pixel in the image whose resolution has been reduced by the first reduction means;
4. The color of the character region is changed by assigning the determined background color to the character region of the image whose resolution has been reduced by the first reduction means. Image compression device.

The first lowering means is
Determining a resolution reduction rate according to a memory capacity that can be used to store an image whose resolution is reduced by the first reduction means;
5. The image compression apparatus according to claim 1, wherein the resolution of the input image is reduced according to the determined resolution reduction rate. 6.

A reception process for accepting a specification regarding resolution from a user;
An input process for inputting an image;
A first reduction step of reducing the resolution of the input image;
A change step of changing the color of the character region in the image whose resolution is reduced by the first reduction step using the color of the region other than the character region;
A second reduction step of reducing the resolution of the image in which the color of the character region is changed to a resolution based on the received designation;
And a compression step of compressing the image whose resolution has been reduced by the second reduction step.

A computer-readable computer program for causing a computer to execute the image compression method according to claim 6 .